I remember while in wrestling that we trained our necks using yes-no' exercises. You would lay on the floor, on your back, and begin by doing the 'yes' motion. Up and down with no resting on the floor. Then right after, you'd do the no motion. Head about 1" off the ground and full turn left to right and then back.
We use to do 30 yes' and then 30 no's. Next set, 29 yes', 29 no's..you get the point. You'd usually count down to at least 25 or as low as you want.
I found the best way to do these is with your head laying off the side of your bed. Trust me, if you havent done neck exercises before...you'll be sore the next day. Forget counting sheep at night, these will put you out.